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They rank as the class of tetrapods with the most living species, at approximately ten thousand, with more than half of these being passerines, sometimes known as perching birds.

Aves and a sister group, the clade Crocodilia, contain the only living representatives of the reptile clade Archosauria.They are descendants of extinct dinosaurs with feathers, making them the only surviving dinosaurs according to cladistics.The fossil record indicates that birds evolved from feathered ancestors within the theropod group, which are traditionally placed within the saurischian dinosaurs.Birds produce offspring by laying eggs which are fertilised through sexual reproduction.They are usually laid in a nest and incubated by the parents.